scholarly journals Study on Applicability of Accelerated Deterioration Test for Evaluation of Bond Property in Concrete Surface Coating System

2013 ◽  
Vol 62 (8) ◽  
pp. 524-530
Author(s):  
Takuji YAMADA ◽  
Yoichi TSUKUDA ◽  
Takashi YAMAMOTO ◽  
Minoru KUNIEDA ◽  
Toyoaki MIYAGAWA
Keyword(s):  
Surface Coating ◽  
Concrete Surface ◽  
Coating System ◽  
Bond Property

scholarly journals Durability Evaluation Method Focused on Bond Property of Concrete Surface Coating System

2012 ◽  
Vol 61 (10) ◽  
pp. 831-836
Author(s):  
Takuji YAMADA ◽  
Yoichi TSUKUDA ◽  
Takashi YAMAMOTO ◽  
Minoru KUNIEDA ◽  
Toyoaki MIYAGAWA
Keyword(s):  
Surface Coating ◽  
Evaluation Method ◽  
Concrete Surface ◽  
Coating System ◽  
Bond Property

Chloride penetration into reinforced concrete slabs

1998 ◽  
Vol 25 (1) ◽  
pp. 87-95 ◽  
Author(s):  
A K Suryavanshi ◽  
R N Swamy ◽  
S McHugh
Keyword(s):  
Reinforced Concrete ◽  
Surface Coating ◽  
Lateral Diffusion ◽  
Chloride Penetration ◽  
Chloride Diffusion ◽  
Concrete Slabs ◽  
Coating System ◽  
Depth Of Penetration ◽  
Lateral Direction ◽  
Reinforced Concrete Slabs

The overall aim of this paper is to establish the process and amount of chlorides penetrating reinforced concrete elements when exposed to a salt-laden environment. For this purpose, a number of slabs were subjected to 70 cycles of wetting-drying regime with a 4% sodium chloride solution over a period of 2-3 years. To examine the direction of transportation of the chlorides, some of the slabs were partially coated with a surface coating system known to be highly resistant to chloride penetration. The amount and depth of penetration of chlorides in the coated and uncoated parts of the slab were then determined. The results show conclusively that, in large exposed areas of concrete, chlorides diffuse both in the direction of depth and in a direction lateral to the depth of the element. The amount of chlorides and the distance of their lateral diffusion depend on the water-to-cement (w/c) ratio of the concrete and the duration of exposure. Concrete mixes with a high w/c ratio (0.75) are highly conducive to this lateral diffusion of chlorides. Although concrete mixes of lower w/c ratios (0.45 and 0.60) are less conducive to lateral diffusion of chlorides, in practice, all concretes should be considered to be prone to chloride diffusion in both the direction of gravity and the lateral direction because of the effects of cracking. In unprotected concrete, reducing the w/c ratio from 0.60 to 0.45 is far more effective in decreasing chloride penetration than that achieved by reducing the w/c ratio from 0.75 to 0.60. The acrylic-based surface coating system is totally resistant to chloride penetration.Key words: chloride diffusion, concrete slabs, durability, water-to-cement ratio, surface coating, lateral diffusion.

scholarly journals An Effect of Concrete Surface Coating on Internal Stress of ASR-affected RC Beams and RC Columns under Sustained Load

1995 ◽  
Vol 6 (2) ◽  
pp. 9-20
Author(s):  
Hidenori Hamada ◽  
R.N. Swamy ◽  
Shin Tanikawa ◽  
Jaw-Chang Laiw
Keyword(s):  
Internal Stress ◽  
Surface Coating ◽  
Concrete Surface ◽  
Sustained Load ◽  
Rc Beams ◽  
Rc Columns

scholarly journals Evaluation of Concrete Surface Coating Method Applied to San-yo Shinkansen RC Structures

2009 ◽  
Vol 58 (8) ◽  
pp. 691-696 ◽  
Author(s):  
Yoshihiko WATANABE ◽  
Satoshi ARAMAKI ◽  
Yoshifumi MATSUDA ◽  
Takuji YAMADA ◽  
Toyoaki MIYAGAWA
Keyword(s):  
Surface Coating ◽  
Concrete Surface ◽  
Rc Structures ◽  
Coating Method

scholarly journals Novel Surface Coating System Based on Maleated Shellac

2010 ◽  
Vol 7 (s1) ◽  
pp. S55-S60 ◽  
Author(s):  
Hasmukh S. Patel ◽  
Sumeet J. Patel
Keyword(s):  
Maleic Anhydride ◽  
Surface Coating ◽  
Chemical Resistance ◽  
Natural Forest ◽  
Coating System ◽  
Good Adhesion ◽  
Coating Materials ◽  
Film Performance ◽  
Plaster Of Paris ◽  
Acrylic Resins

Shellac a natural forest product was reacted with various proportion of maleic anhydride. The resulted maleated shellac samples were designated as (MS-1 to 3) and applied for the preparation of surface coating material. Thus various compositions of coating materials were prepared by varying the contents of MS and commercial grades of acrylic resins (AR). The coating materials were applied on substrates like plaster of paris, cement and limed surface. All the coating showed film performance with good adhesion finish, smoothness and lack of flaking on the surfaces. The results show that the coating showed good water and chemical resistance.

scholarly journals Evaluation of the Uniformity of Protective Coatings on Concrete Structure Surfaces Based on Cluster Analysis

Sensors ◽  
2021 ◽  
Vol 21 (16) ◽  
pp. 5652
Author(s):  
Dunwen Liu ◽  
Wanmao Zhang ◽  
Yu Tang ◽  
Yinghua Jian ◽  
Chun Gong ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Surface Coating ◽  
Evaluation Method ◽  
Protective Coatings ◽  
Concrete Surface ◽  
Distribution Data ◽  
Positive Contribution ◽  
Infrared Images ◽  
Coating Uniformity ◽  
Durability Of Concrete

With the continuous development of urbanization and industrialization in the world, concrete is widely used in various engineering constructions as an engineering material. However, the consequent problem of durability of concrete structures is also becoming increasingly prominent. As an important additional measure, a protective coating can effectively improve the durability of concrete performance. Moreover, the uniformity of the concrete surface coating will directly affect its protective effect. Therefore, we propose a nondestructive inspection and evaluation method of coating uniformity based on infrared imaging and cluster analysis for concrete surface coating uniformity detection and evaluation. Based on the obtained infrared images, a series of processing and analysis of the images were carried out using MATLAB software to obtain the characteristics of the infrared images of the concrete surface. Finally, by extracting the temperature distribution data of the pixel points on the concrete surface, an evaluation method of concrete surface coating uniformity based on a combination of cluster analysis and hierarchical analysis was established. The evaluation results show that the determination results obtained by this method are consistent with the actual situation. This study has a positive contribution to the testing of concrete surface coating uniformity and its evaluation.

scholarly journals Evaluation of the Uniformity of Protective Coatings on Concrete Structure Surfaces Based on Cluster Analysis

2021 ◽  
Author(s):  
Dunwen Liu ◽  
Wanmao Zhang ◽  
Yu Tang ◽  
Yinghua Jian ◽  
Chun Gong ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Surface Coating ◽  
Evaluation Method ◽  
Protective Coatings ◽  
Concrete Surface ◽  
Distribution Data ◽  
Positive Contribution ◽  
Infrared Images ◽  
Coating Uniformity ◽  
Durability Of Concrete

With the continuous development of urbanization and industrialization in the world, concrete is widely used in various engineering constructions as an engineering material. However, the consequent problem of durability of concrete structures is also becoming increasingly prominent. As an important additional measures, protective coating can effectively improve the durability of concrete performance. Moreover, the uniformity of the concrete surface coating will directly affect its protective effect. Therefore, we propose a nondestructive inspection and evaluation method of coating uniformity based on infrared imaging and cluster analysis for concrete surface coating uniformity detection and evaluation. Based on the obtained infrared images, a series of processing and analysis of the images were carried out using MATLAB software to obtain the characteristics of the infrared images of concrete surface. Finally, by extracting the temperature distribution data of the pixel points on the concrete surface, an evaluation method of concrete surface coating uniformity based on a combination of cluster analysis and hierarchical analysis was established. The evaluation results show that the determination results obtained by this method are consistent with the actual situation. This study has a positive contribution to the testing of concrete surface coating uniformity and its evaluation.

scholarly journals Assessing the effect of a coating system on the rate of plywood moistening and changes in dimensions in relation to the change in relative air humidity

2012 ◽  
Vol 50 (No. 2) ◽  
pp. 86-100
Author(s):  
P. Král ◽  
J. Hrázský
Keyword(s):  
Surface Coating ◽  
Bending Strength ◽  
Coating System ◽  
Institutional Research ◽  
Air Humidity ◽  
Surface Layers ◽  
Dimensional Changes ◽  
Relative Air Humidity ◽  
Sheet Structure ◽  
Axis Of Symmetry

The paper summarizes results of an institutional research aimed at the evaluation of the effect of a coating system on the rate of plywood moistening and changes in dimensions in relation to changes in relative air humidity. Coefficients of dimensional changes were determined in relation to relative air humidity and effects were studied of the coating system on the rate of plywood moistening. All measurements were carried out in water-resistant combined plywood with surface coating and thickness of 8, 10, 12, 15 and 18 mm and in all-beech plywood 10, 12, 15 and 18 mm in thickness. Based on the results obtained it is possible to state that bending strength and modulus of elasticity are decisively affected by the construction of a sheet. Therefore, it is suitable to select the sheet structure according to requirements of a customer. It is known that surface layers transfer the greatest stress and that the stress of layers decreases towards the axis of symmetry. The fact can be used in designing the sheet structure, e.g. using veneers manufactured from cheaper species for central layers. Thus, the price and even density of plywood can be substantially reduced maintaining the required strength. By means of coats it is possible to reduce substantially penetration of moisture across the plywood edge. Comparisons between polyurethane coat U 2070 and acrylate coat AQUACOL V 2080 are demonstrated in <br />a figure. Changes in the length and width of combined plywood and all-beech plywood amount to on average 0.020&ndash;0.025% per <br />1% change in moisture. Under upper values of the moisture range the changes are generally substantially lower. In practice, a suitable clearance for changes in the length and width of plywood amounts to 2 mm/m. Changes in thickness reach on average 0.4&ndash;0.5% per 1% changes in the moisture content.

Sign in / Sign up

Export Citation Format

Share Document